CN105242062A - Fan rotating speed detection apparatus - Google Patents
Fan rotating speed detection apparatus Download PDFInfo
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- CN105242062A CN105242062A CN201510654039.XA CN201510654039A CN105242062A CN 105242062 A CN105242062 A CN 105242062A CN 201510654039 A CN201510654039 A CN 201510654039A CN 105242062 A CN105242062 A CN 105242062A
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- fan
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- schmitt trigger
- speed detection
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Abstract
The invention relates to a fan rotating speed detection apparatus. The apparatus comprises a first capacitor, a first resistor, a first Schmitt trigger, a modulation circuit and a controller. One end of the first capacitor is connected to a signal output end of a fan, and the other end of the capacitor is connected to the input end of the first Schmitt trigger and is connected to the ground through the first resistor. The output end of the first Schmitt trigger is connected to the controller through the modulation circuit. A periodic signal output from the fan is converted into a pulse signal through a charge and discharge loop, the pulse signal is then output to the input end of the first Schmitt trigger, the first Schmitt trigger shapes the pulse signal into a rectangular wave signal, the modulation circuit modulates the rectangular wave signal and a reference voltage of the modulation circuit, then a voltage signal is obtained and input to the controller, the controller samples the voltage signal and a corresponding voltage value is obtained, and therefore the rotating speed of the fan is obtained. The apparatus can provides the program execution efficiency of the controller, and the detection cost for the rotating speed of a fan is reduced.
Description
Technical field
The present invention relates to fan control technical field, particularly relate to a kind of fan rotation-speed detection device.
Background technology
Current fan is widely used in each product scope, and especially in complete machine heat dissipation design, the use of fan is essential especially.Generally for the excellent heat dispersion performance and product reliability that ensure product, need to go in real time to monitor rotation speed of the fan.Traditional rotation speed of the fan detection scheme is generally directly by the periodic signal input control device of fan output, utilize above-mentioned controller from its periodic signal, obtain the rotating speed of this fan, the clock sources of so easy consumption controller inside, causes executing efficiency low.
Summary of the invention
Based on this, be necessary the clock sources easily consuming controller inside for conventional art, cause the technical matters that executing efficiency is low, a kind of fan rotation-speed detection device is provided.
A kind of fan rotation-speed detection device, comprising: the first electric capacity, the first resistance, first this schmitt trigger, modulation circuit and controller;
One end of described first electric capacity connects the signal output part of fan, and the other end connects the input end of first this schmitt trigger and passes through the first resistance eutral grounding, and the output terminal of described first this schmitt trigger is by described modulation circuit connection control device;
The periodic signal that fan exports is converted to the input end of this schmitt trigger of output of pulse signal to the first by the charging and discharging circuit be made up of the first electric capacity and the first resistance, described pulse signal is shaped as square-wave signal by first this schmitt trigger, the reference voltage of described modulation circuit to described square-wave signal and modulation circuit is modulated, obtain the voltage signal that described square-wave signal is corresponding, and by described voltage signal input control device, described controller is sampled to described voltage signal, obtain the magnitude of voltage that described voltage signal is corresponding, and the rotating speed of described fan is obtained according to described magnitude of voltage.
Said fans speed detector, the periodic signal that fan exports is converted to pulse signal by the charging and discharging circuit be made up of the first electric capacity and the first resistance, recycle above-mentioned first this schmitt trigger and above-mentioned pulse signal is shaped as square-wave signal, after above-mentioned square-wave signal inputs corresponding modulation circuit, above-mentioned modulation circuit is modulated itself and the reference voltage adjusting voltage, to obtain voltage signal corresponding to described square-wave signal, controller is sampled to it after obtaining above-mentioned voltage signal, to obtain magnitude of voltage corresponding to described voltage signal, and then obtain the rotating speed of described fan, the periodic signal that fan exports is converted to corresponding magnitude of voltage by it, the mode sampling to obtain rotation speed of the fan to voltage signal is become in the mode obtaining rotation speed of the fan from traditional direct count measurement clock cycle, the Software for Design of corresponding controllers can be simplified, reduce the use of controller internal clocking resource, improve the operational efficiency of its Program, especially in the more situation of system fan, adopt traditional measurement mode, controller clock resource may be caused to satisfy the demands, and select more senior controller, then cost can be increased, the application obtains rotation speed of the fan by the mode of the magnitude of voltage measuring corresponding signal, do not consume controller internal clocking resource, the executing efficiency of controller can be provided, reduce the testing cost of rotation speed of the fan.
Accompanying drawing explanation
Fig. 1 is the fan rotation-speed detection device structural representation of an embodiment;
Fig. 2 is the fan rotation-speed detection device structural representation of a preferred embodiment.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to fan rotation-speed detection device provided by the invention.
With reference to figure 1, Figure 1 shows that the fan rotation-speed detection device structural representation of an embodiment, comprising: first this schmitt trigger 21 of electric capacity 11, first resistance 13, first, modulation circuit 30 and controller 25;
One end of described first electric capacity 11 connects the signal output part of fan, the other end connects the input end of first this schmitt trigger 21 and passes through the first resistance 13 ground connection, and the output terminal of described first this schmitt trigger 21 is by described modulation circuit 30 connection control device 25;
The periodic signal that fan exports is converted to the input end of this schmitt trigger 21 of output of pulse signal to the first by the charging and discharging circuit be made up of the first electric capacity 11 and the first resistance 13, described pulse signal is shaped as square-wave signal by first this schmitt trigger 21, the reference voltage of described modulation circuit 30 to described square-wave signal and modulation circuit 30 is modulated, obtain the voltage signal that described square-wave signal is corresponding, and by described voltage signal input control device 25, described controller 25 is sampled to described voltage signal, obtain the magnitude of voltage that described voltage signal is corresponding, and the rotating speed of described fan is obtained according to described magnitude of voltage.
In the present embodiment, above-mentioned controller 25 can by carrying out AD sampling with the magnitude of voltage obtaining relevant voltage signal to described voltage signal.
The fan rotation-speed detection device that the present embodiment provides, the periodic signal exported by fan is converted to pulse signal by the charging and discharging circuit be made up of the first electric capacity 11 and the first resistance 13, recycle above-mentioned first this schmitt trigger 21 and above-mentioned pulse signal is shaped as square-wave signal, after above-mentioned square-wave signal inputs corresponding modulation circuit 30, above-mentioned modulation circuit 30 is modulated itself and the reference voltage adjusting voltage, to obtain voltage signal corresponding to described square-wave signal, controller 25 is sampled to it after obtaining above-mentioned voltage signal, to obtain magnitude of voltage corresponding to described voltage signal, and then obtain the rotating speed of described fan, the periodic signal that fan exports is converted to corresponding magnitude of voltage by it, the mode sampling to obtain rotation speed of the fan to voltage signal is become in the mode obtaining rotation speed of the fan from traditional direct count measurement clock cycle, the Software for Design of corresponding controllers can be simplified, reduce the use of controller internal clocking resource, improve the operational efficiency of its Program, especially in the more situation of system fan, adopt traditional measurement mode, controller clock resource may be caused to satisfy the demands, and select more senior controller, then cost can be increased, the application obtains rotation speed of the fan by the mode of the magnitude of voltage measuring corresponding signal, do not consume controller internal clocking resource, the executing efficiency of controller can be provided, reduce the testing cost of rotation speed of the fan.
With reference to figure 2, Figure 2 shows that the fan rotation-speed detection device structural representation of a preferred embodiment, as shown in Figure 2, said fans speed detector can also comprise second this schmitt trigger 12, described second this schmitt trigger 12 is connected between the signal output part of fan and the first electric capacity 11, and second this schmitt trigger 12 carries out shaping for the periodic signal exported fan.
In the present embodiment, input the charging and discharging circuit be made up of the first electric capacity 11 and the first resistance 13 again after the periodic signal that fan exports carries out shaping by above-mentioned second this schmitt trigger 12 and carry out corresponding conversion, make the waveform of the above-mentioned charging and discharging circuit of input more regular.
As shown in Figure 2, in one embodiment, said fans speed detector can also comprise the second resistance 24, and described second resistance 24 is connected between described controller and earth terminal, described second resistance is used for providing load for corresponding loop, can improve the stability of its circuit.
In one embodiment, above-mentioned modulation circuit is Buck conversion circuit (BUCK circuit).
As an embodiment, above-mentioned Buck conversion circuit can comprise power supply 301, triode 302, diode 303, inductance with 304 and second electric capacity 305;
The output terminal of described first this schmitt trigger 21 connects the base stage of described triode 302, the collector of described triode 302 connects power supply 301, the emitter of described triode 302 is by inductance 304 connection control device, the input end grounding of described diode 303, the emitter of the output terminal connecting triode 302 of described diode 303, described controller is by the second electric capacity 305 ground connection.Wherein, the collector of one end connecting triode 302 of above-mentioned power supply 301, other end ground connection.
In the present embodiment, by the BUCK circuit be made up of above-mentioned components and parts, the voltage of power supply 301 is modulated by described square-wave signal, effectively can obtain voltage signal corresponding to square-wave signal, for the Rotating speed measring of respective fans.Wherein, the voltage of above-mentioned power supply 301 is the reference voltage of modulation circuit.
In one embodiment, magnitude of voltage corresponding for described voltage signal, reference voltage and high level lasting time, for obtaining the high level lasting time in magnitude of voltage corresponding to described voltage signal, the reference voltage of described modulation circuit, described square-wave signal one-period, are substituted into the rotating speed that rotating speed calculates fan described in formulae discovery by above-mentioned controller respectively.
As an embodiment, above-mentioned triode can be NPN type triode.
As an embodiment, above-mentioned rotating speed computing formula can be:
wherein, N represents the rotating speed of fan, k represents time constant, V
aDCrepresent magnitude of voltage, V that described voltage signal is corresponding
rEFrepresent reference voltage, T
2represent the high level lasting time in square wave one-period, * represents and be multiplied.Wherein, time constant k can be arranged according to the configuration of respective fans, generally speaking, the fan of each model or each series corresponding one regular time constant.
As an embodiment, the value of above-mentioned time constant k can be 30.
In the present embodiment, above-mentioned rotating speed computing formula
derivation can comprise:
Fan rotation-speed detection device as shown in Figure 2, if corresponding rotation speed of the fan is N, the periodic signal period that fan feedback signal exports is T
1, the high level lasting time in the square-wave signal after first this schmitt trigger 21 shaping in one-period is T
2, the voltage of voltage signal is V
aDC, reference voltage is V
rEF, following relational expression can be arranged:
Just can derive according to above-mentioned two equatioies:
wherein, T
2can determine according to the parameter of the first electric capacity 11, first resistance 13.
In one embodiment, above-mentioned controller can be micro-control unit (MCU).
In the present embodiment, above-mentioned micro-control unit (MicrocontrollerUnit; MCU), also known as one chip microcomputer (SingleChipMicrocomputer) or single-chip microcomputer, be central processing unit (CentralProcessUnit; CPU) frequency and specification do suitable reduction, and are all incorporated on one chip by the perimeter interfaces such as internal memory, counter, A/D conversion, form the computing machine of chip-scale.Above-mentioned controller adopts MCU can reduce the cost of said fans speed detector, and reduce the volume of fan rotation-speed detection device, the fan rotation-speed detection device that the application is provided is more easy to carry and transport.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a fan rotation-speed detection device, is characterized in that, comprising: the first electric capacity, the first resistance, first this schmitt trigger, modulation circuit and controller;
One end of described first electric capacity connects the signal output part of fan, and the other end connects the input end of first this schmitt trigger and passes through the first resistance eutral grounding, and the output terminal of described first this schmitt trigger is by described modulation circuit connection control device;
The periodic signal that fan exports is converted to the input end of this schmitt trigger of output of pulse signal to the first by the charging and discharging circuit be made up of the first electric capacity and the first resistance, described pulse signal is shaped as square-wave signal by first this schmitt trigger, the reference voltage of described modulation circuit to described square-wave signal and modulation circuit is modulated, obtain the voltage signal that described square-wave signal is corresponding, and by described voltage signal input control device, described controller is sampled to described voltage signal, obtain the magnitude of voltage that described voltage signal is corresponding, and the rotating speed of described fan is obtained according to described magnitude of voltage.
2. fan rotation-speed detection device according to claim 1, it is characterized in that, also comprise second this schmitt trigger, described second this schmitt trigger is connected between the signal output part of fan and the first electric capacity, and the periodic signal that described second this schmitt trigger is used for fan exports carries out shaping.
3. fan rotation-speed detection device according to claim 1, is characterized in that, also comprises the second resistance, and described second resistance is connected between described controller and earth terminal.
4. fan rotation-speed detection device according to claim 1, is characterized in that, described modulation circuit is Buck conversion circuit.
5. fan rotation-speed detection device according to claim 4, is characterized in that, described Buck conversion circuit comprises power supply, triode, diode, inductance and the second electric capacity;
The output terminal of described first this schmitt trigger connects the base stage of described triode, the collector of described triode connects power supply, the emitter of described triode is by inductance connection control device, the input end grounding of described diode, the emitter of the output terminal connecting triode of described diode, described controller is by the second capacity earth.
6. fan rotation-speed detection device according to claim 1, it is characterized in that, magnitude of voltage corresponding for described voltage signal, reference voltage and high level lasting time, for obtaining the high level lasting time in magnitude of voltage corresponding to described voltage signal, the reference voltage of described modulation circuit, described square-wave signal one-period, are substituted into the rotating speed that rotating speed calculates fan described in formulae discovery by described controller respectively.
7. fan rotation-speed detection device according to claim 6, is characterized in that, described triode is NPN type triode.
8. fan rotation-speed detection device according to claim 6, is characterized in that, described rotating speed computing formula is:
wherein, N represents the rotating speed of fan, k represents time constant, V
aDCrepresent magnitude of voltage, V that described voltage signal is corresponding
rEFrepresent reference voltage, T
2represent the high level lasting time in square wave one-period, * represents and be multiplied.
9. fan rotation-speed detection device according to claim 8, is characterized in that, the value of described time constant k is 30.
10. fan rotation-speed detection device according to claim 1, is characterized in that, described controller is micro-control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510654039.XA CN105242062B (en) | 2015-10-10 | 2015-10-10 | Fan rotation-speed detection device |
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| CN201510654039.XA CN105242062B (en) | 2015-10-10 | 2015-10-10 | Fan rotation-speed detection device |
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Cited By (3)
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| CN107389969A (en) * | 2017-07-31 | 2017-11-24 | 苏州华亚智能科技股份有限公司 | A kind of brushless dc tachometer |
| CN107831395A (en) * | 2017-12-06 | 2018-03-23 | 杭州嘉楠耘智信息科技股份有限公司 | Fan detection system and method |
| CN107834916A (en) * | 2017-11-22 | 2018-03-23 | 魏海峰 | A kind of inexpensive velocity indicating device of brshless DC motor |
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| US20020135337A1 (en) * | 2001-03-22 | 2002-09-26 | Shimano, Inc. | Bicycle battery charger and speedometer circuit |
| CN102590544A (en) * | 2012-03-14 | 2012-07-18 | 南京埃斯顿自动控制技术有限公司 | Method and device for testing speed of servo motor during low-speed running |
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| CN1210980A (en) * | 1997-09-10 | 1999-03-17 | 建准电机工业股份有限公司 | Tachometer for DC motor rotating speed |
| US20020135337A1 (en) * | 2001-03-22 | 2002-09-26 | Shimano, Inc. | Bicycle battery charger and speedometer circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389969A (en) * | 2017-07-31 | 2017-11-24 | 苏州华亚智能科技股份有限公司 | A kind of brushless dc tachometer |
| CN107834916A (en) * | 2017-11-22 | 2018-03-23 | 魏海峰 | A kind of inexpensive velocity indicating device of brshless DC motor |
| CN107831395A (en) * | 2017-12-06 | 2018-03-23 | 杭州嘉楠耘智信息科技股份有限公司 | Fan detection system and method |
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| CN105242062B (en) | 2019-11-26 |
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